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Open-source webmail

8 webmail whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

  1. Horde Groupware Webmail Edition Grade B

    Self-hosted, open-source groupware suite built on the Horde framework, with the IMP webmail client, mail filters, calendar, contacts, tasks and notes.

    GPL-2.0, with the Horde framework libraries under LGPL. Source code

  2. SnappyMail Grade B

    Self-hosted, IMAP-only webmail client forked from RainLoop, with built-in OpenPGP support.

    AGPL-3.0. Source code

  3. Cypht Grade B

    Self-hosted, open-source webmail that combines several IMAP, JMAP and SMTP accounts, plus feeds, in one interface, built from optional modules.

    LGPL-2.1. Source code

  4. Nextcloud Mail Grade B

    Open-source mail app for self-hosted Nextcloud servers that adds webmail for any IMAP account, with S/MIME, Mailvelope support and integration with Nextcloud contacts and calendar.

    AGPL-3.0. Source code

  5. RoundCube Grade B

    Browser-based multilingual IMAP client with an application-like user interface.

    GPL-3.0. Source code

  6. SquirrelMail Grade B

    Self-hosted PHP webmail with built-in IMAP and SMTP support that renders plain HTML pages without JavaScript and is extended through plugins.

    GPL-2.0. Source code

  7. Afterlogic WebMail Lite Grade C

    Self-hosted, open-source PHP webmail for an existing IMAP server, with contacts, OpenPGP in the browser and a module system. A paid Pro edition adds more features.

    AGPL-3.0, with a commercial license also offered. Source code

  8. SOGo Grade C

    Self-hosted, open-source groupware server with webmail, calendars and address books, supporting CalDAV, CardDAV and ActiveSync. It uses an existing IMAP server for mail.

    GPL-2.0, with libraries under LGPL-2.1. Source code

Compare all 10 webmail, open source or not.